2110202021 has 4 divisors (see below), whose sum is σ = 2139108972. Its totient is φ = 2081295072.

The previous prime is 2110202009. The next prime is 2110202033. The reversal of 2110202021 is 1202020112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2110202009) and next prime (2110202033).

It can be written as a sum of positive squares in 2 ways, for example, as 1665456100 + 444745921 = 40810^2 + 21089^2 .

It is a cyclic number.

It is not a de Polignac number, because 2110202021 - 2⁶ = 2110201957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2110201993 and 2110202011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2110202041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14453366 + ... + 14453511.

It is an arithmetic number, because the mean of its divisors is an integer number (534777243).

Almost surely, 2^2110202021 is an apocalyptic number.

It is an amenable number.

2110202021 is a deficient number, since it is larger than the sum of its proper divisors (28906951).

2110202021 is an equidigital number, since it uses as much as digits as its factorization.

2110202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28906950.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2110202021 is about 45936.9352591137. The cubic root of 2110202021 is about 1282.6495453394.

Adding to 2110202021 its reverse (1202020112), we get a palindrome (3312222133).

The spelling of 2110202021 in words is "two billion, one hundred ten million, two hundred two thousand, twenty-one".